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Inspector Matt Ashmead from the Met's Central Football Unit said: "Several devices were let off inside the away end at Stamford Bridge on Saturday and officers seized a number of other devices on the day as well.

"Flares and pyrotechnic devices inside stadia are very dangerous and they can reach extremely high temperatures.

"There is a very good reason that they are banned from football matches, as they can cause horrific injuries and can also be frightening for the many young fans that attend matches.

"Some fans might think that setting off a flare is a good way to support your team, but it is putting yourself and fellow fans at risk. Bringing flares to football matches is completely unacceptable and you can expect to be arrested and charged if you are caught in possession of such a device."